What I’m currently hoping for:
Loadouts. These let you choose between a series of non-power-weapons to spawn with - BR, AR, DMR, and any Covie/Forerunner equivalents.
Sprint. Available for everybody off-spawn.
Armour Abilities. As default, they’re scattered across the map, but there will be some gametypes which let you pick AAs off spawn.
More Fiesta, because you love it and you know it.
Grenade regeneration on (slow, to stop complete spamming), because we all love explosions.
More stuff like Monster Trucks. Not the totally uncompetitive stuff Action Sack churns out, make it balanced and part of standard gametypes, but a large reason for Social’s existence is to add variety. An occasional gametype that gave everybody a light vehicle off spawn would mix things up well.
Your suggestions: